Đề thi Tiếng Anh ĐGNL Đại học Sư phạm Hà Nội 2024 có đáp án

If Wi-Fi _________, the smartphone and the Internet we use today wouldn't be possible.

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Mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.

If Wi-Fi _________, the smartphone and the Internet we use today wouldn't be possible.

won't be invented

wasn't invented

wouldn't be invented

hadn't been invented

Giải thích

D. hadn't been invented